M35 Step Drill Bit Set for Metal, 19-Step Cobalt Bits - Heavy Duty

In this review the OXMUL M35 Step Drill Bit Set is examined for professionals and serious DIYers who need a dependable way to make stepped holes in stainless steel and other hard materials. The bottom line: this 2-piece set is built around M35 cobalt steel and delivers noticeably faster cutting with long bit life when working through sheet metal, aluminum, or hardened steel plate. It is best for tasks that require repeatedly enlarging or deburring holes without changing bits.

Key Features

• M35 cobalt construction: The 5% cobalt alloy resists heat and wear so bits maintain cutting edge and last longer during heavy use on stainless steel.
• Wide step range: Nineteen stepped diameters cover small pilot holes up to larger openings so one set replaces many individual bits for sheet work.
• Dual shank types: Includes a 1/4in hex shank and a 3/8in tri-flat shank to improve grip in chucks and reduce slip under high torque.
• Straight-flute design: Two straight flutes clear chips faster for smoother cutting and less binding when stepping up hole sizes.
• Rugged carrying case: A fitted case protects the bits in a toolbox and keeps the two sizes together for portability and job-site use.

Who It's For

This set is aimed at metalworkers, fabricators, mechanics and experienced DIYers who frequently drill through stainless steel, galvanized steel, aluminum, copper or other hard metals and want a single tool to step drill multiple hole sizes. It shines on sheet metal tasks such as modifying panels, creating access holes, and drilling through thin structural components.

Those who should look elsewhere include users who only need occasional, single-size holes in wood or masonry or who prefer carbide hole saws for very large diameters; the step bit is optimized for metal sheet and through-holes rather than heavy masonry or very thick plate drilling.

Pros & Cons

Pros

• Excellent cutting speed and edge retention from the M35 cobalt composition.
• Versatile stepped sizes reduce bit changes and speed repetitive hole sizing tasks.
• Secure fit from dual shank options minimizes slippage in high-torque drills.
• Straight flutes help evacuate chips and keep the cut clean on metal sheets.

Cons

• Durability feedback is mixed in heavy continuous use; some users reported wear after extensive pilot-hole work.

Specifications

Set configuration	2-piece step bit set
Material	M35 cobalt steel (1.3243 grade)
Step range	Nineteen steps covering 1/8in to 1-3/8in
Shank types	1/4in hex shank and 3/8in tri-flat shank
Flute design	2 straight flutes
Included accessory	Rugged packing case
Intended materials	Stainless steel, hard metal, aluminum, iron, wood, PVC, copper

Our Verdict

The OXMUL M35 Step Drill Bit Set is a practical, value-oriented choice for anyone who needs reliable stepped drilling in metal sheets and thin plate. Its M35 cobalt construction and dual shank options deliver faster cuts and improved grip, making it worth the investment for frequent metal work, while occasional users should weigh the cost versus occasional single bits.

Frequently Asked Questions

Can these bits cut stainless steel?
Yes. The M35 cobalt composition is formulated to withstand heat and cut through stainless steel and other hard metals effectively.

What hole sizes are covered?
The set provides nineteen stepped diameters from 1/8in up to 1-3/8in to cover a wide range of hole sizes without changing bits.

Will they stay tight in a drill chuck?
The set includes a 1/4in hex shank and a 3/8in tri-flat shank to improve grip and reduce slippage under high torque.